interface: Use proper return codes in the open function
interface: Use proper return codes in the open function

The open function returned -1 in case of an error, but -1 maps
to VIR_DRV_OPEN_DECLINED instead of VIR_DRV_OPEN_ERROR.

sshah-solarflare/Libvirt-PCI-passthrough-,amery/libvirt-vserver,zippy2/libvirt,cbosdo/libvirt,iam-TJ/libvirt,amery/libvirt-vserver,leilihh/libvirt,rbu/libvirt,crobinso/libvirt,foomango/libvirt,rbu/libvirt,foomango/libvirt,datto/libvirt,trainstack/libvirt,libvirt/libvirt,danwent/libvirt-ovs,eskultety/libvirt,rlaager/libvirt,dumbbell/libvirt,wiedi/libvirt,novel/fbsd-libvirt,agx/libvirt,dumbbell/libvirt,agx/libvirt,siboulet/libvirt-openvz,dumbbell/libvirt,emaste/libvirt,agx/libvirt,rmarwaha/libvirt,novel/fbsd-libvirt,soulxu/libvirt-xuhj,novel/fbsd-libvirt,warewolf/libvirt,taget/libvirt,usc-isi/libvirt,novel/fbsd-libvirt,iam-TJ/libvirt,foomango/libvirt,shugaoye/libvirt,datto/libvirt,bjzhang/libvirt,warewolf/libvirt,crobinso/libvirt,iam-TJ/libvirt,nertpinx/libvirt,warewolf/libvirt,jardasgit/libvirt,cbosdo/libvirt,olafhering/libvirt,trainstack/libvirt,kantai/libvirt-vfork,cbosdo/libvirt,trainstack/libvirt,emaste/libvirt,iam-TJ/libvirt,fabianfreyer/libvirt,rmarwaha/libvirt,jardasgit/libvirt,emaste/libvirt,elmarco/libvirt,wiedi/libvirt,bjzhang/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,wiedi/libvirt,rlaager/libvirt,kantai/libvirt-vfork,jardasgit/libvirt,bjzhang/libvirt,wiedi/libvirt,andreabolognani/libvirt,emaste/libvirt,rbu/libvirt,taget/libvirt,siboulet/libvirt-openvz,jfehlig/libvirt,elmarco/libvirt,jardasgit/libvirt,elmarco/libvirt,cbosdo/libvirt,eskultety/libvirt,andreabolognani/libvirt,novel/fbsd-libvirt,rmarwaha/libvirt1,shugaoye/libvirt,jeckersb/libvirt,warewolf/libvirt,rmarwaha/libvirt,wiedi/libvirt,olafhering/libvirt,jfehlig/libvirt,libvirt/libvirt,jeckersb/libvirt,rmarwaha/libvirt1,rmarwaha/libvirt1,andreabolognani/libvirt,soulxu/libvirt-xuhj,olafhering/libvirt,libvirt/libvirt,jeckersb/libvirt,trainstack/libvirt,jeckersb/libvirt,jfehlig/libvirt,danwent/libvirt-ovs,amery/libvirt-vserver,rmarwaha/libvirt1,leilihh/libvirt,novel/fbsd-libvirt,usc-isi/libvirt,soulxu/libvirt-xuhj,bjzhang/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,warewolf/libvirt,zhlcindy/libvirt-1.1.4-maintain,novel/fbsd-libvirt,leilihh/libvirt,danwent/libvirt-ovs,dumbbell/libvirt,taget/libvirt,nertpinx/libvirt,leilihh/libvirt,rmarwaha/libvirt,eskultety/libvirt,jeckersb/libvirt,leilihh/libvirt,dumbbell/libvirt,crobinso/libvirt,jardasgit/libvirt,emaste/libvirt,warewolf/libvirt,fabianfreyer/libvirt,siboulet/libvirt-openvz,zippy2/libvirt,amery/libvirt-vserver,leilihh/libvirt,usc-isi/libvirt,soulxu/libvirt-xuhj,andreabolognani/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,bjzhang/libvirt,olafhering/libvirt,jfehlig/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,emaste/libvirt,foomango/libvirt,iam-TJ/libvirt,VenkatDatta/libvirt,trainstack/libvirt,dumbbell/libvirt,foomango/libvirt,jeckersb/libvirt,rmarwaha/libvirt,eskultety/libvirt,kantai/libvirt-vfork,crobinso/libvirt,jeckersb/libvirt,rlaager/libvirt,nertpinx/libvirt,zippy2/libvirt,fabianfreyer/libvirt,novel/fbsd-libvirt,agx/libvirt,VenkatDatta/libvirt,wiedi/libvirt,rmarwaha/libvirt,wiedi/libvirt,taget/libvirt,andreabolognani/libvirt,usc-isi/libvirt,zhlcindy/libvirt-1.1.4-maintain,shugaoye/libvirt,shugaoye/libvirt,usc-isi/libvirt,soulxu/libvirt-xuhj,VenkatDatta/libvirt,siboulet/libvirt-openvz,rlaager/libvirt,taget/libvirt,emaste/libvirt,zhlcindy/libvirt-1.1.4-maintain,datto/libvirt,trainstack/libvirt,elmarco/libvirt,eskultety/libvirt,zippy2/libvirt,warewolf/libvirt,kantai/libvirt-vfork,rlaager/libvirt,amery/libvirt-vserver,rbu/libvirt,rmarwaha/libvirt1,fabianfreyer/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,siboulet/libvirt-openvz,datto/libvirt,danwent/libvirt-ovs,datto/libvirt,nertpinx/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,elmarco/libvirt,iam-TJ/libvirt,trainstack/libvirt,libvirt/libvirt,VenkatDatta/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,iam-TJ/libvirt,agx/libvirt,novel/fbsd-libvirt,rmarwaha/libvirt1,danwent/libvirt-ovs,kantai/libvirt-vfork,fabianfreyer/libvirt,rbu/libvirt